Server-Sent Events (SSE) Playground

Tag: Server-Sent Events (SSE) Playground

2+ tools

New

EventSource Polyfill Demo - Online See SSE with Custom Headers

Demonstrate how to add custom headers and POST‑like functionality to EventSource using a polyfill. Code and example.

Developer Tools demo EventSource polyfill SSE

New

SSE (EventSource) Tester - Online Stream Listener

Connect to an SSE endpoint and display events in real time. Inspect event types and data. Handy for frontend devs.

Developer Tools EventSource SSE stream test